Exactly 29 years after its momentous performance at Woodstock, Ten Years After is returning for an encore.

"I'm not anticipating another Woodstock, but it's a magical place, so you never know what might happen," says (Alvin) Lee, 53. "I'm looking forward to it."

Saturday's marquee boasts Joni Mitchell, Lou Reed, Donovan, Melanie and Woodstock alums Richie Havens and Pete Townshend (with drummer Zac Starkey, son of ex-Beatle Ringo Starr). Newer acts Third Eye Blind, Goo Goo Dolls, Joan Osborne, Dishwalla and Marcy Playground play Sunday.